Centering-square.



J. W. CONNERY.

CENTERING SQUARE. APPLICATION. FILED 001.5. 1914.

1,146,691. Patented July 13, 1915.

MIMI! IMMMMMM N411 Illu/w'l'n lylillvlmm .5 ILM/M f /lA/i/hllllihhll ters of cylindrical bodies.

nur rar JAMES w. contient?, or Knwannn, ILLINoIs.

cnNTERmG-SQUARE.

, Specification of Letters Patent.

Patented .nay is, isis..

Application filed October 5, 1914. `Serial No. 865,080.

To all er1/Omit may concern Ber it known that I, JAMES W. CONNERY, a citizen of the United States, residing at Kewanee, in the county of Henry and State of Illinois, have invented certain new and useful Improvements in Centering-Sqiiaies and I do declare ythe Vfollowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains' to malre and use the same.

My invention relates broadly to improvements in metal workers tools, and more particularly to devices for determining the cen- Heretofore, a tool has been provided for this purpose, comprising a pair of diverging rigidly connected arms, and a blade projecting centrally between the two arms. It has been found that rough usage often causes the arms to be bent or warped to such an extent as to prevent the tool from being accurate in its work. It is to overcome this most objectionable feature, that I have provided my improved centering square which is equipped with a pair of diverging arms, one being pivoted to the other, means being provided whereby the pivoted arm may be locked against movement. By this means, any inaccuracy in the instrument may be easily corrected.

With the above and minor objects in view,

the invention resides in certain novel features of construction and combination herein described and claimed and shown in the drawings wherein;

Figure 1 is a side. elevation of a tool constructed in accordance with my invention; Fig. 2 is an endview thereof; Fig. 3 is a vertical transverse section taken on the line 3-3 of Fig. 1; Fig. 4 is a longitudinal section as seen on the line 4-4 of Fig. 2; and Fig. 5 is a transverse section taken along the plane of the line 5-5 of Fig. 4.

In the accompanying illustration, the numeral 1 designates a blade which is provided with a klongitudinal groove 2 in one of its sides, and with graduated scales 3 along its opposite side edges. Slidably mounted upon the blade 1 is a head 4 which may be of any appropriate designy and which is provided with a pair of upright grooves 5 on opposite sides of the slot 6 through which the blade l passes. These grooves are provided for the reception of a cylindrical head 7 of a locking bolt 8, which rises through a boss 9 on the upper side of the head, and which is provided with a depending finger having a lug 10 'on its lower end, said lug being located within the groove 2, whereby when a clamping nut 13 upon 8 is tightened, the head and blade held against relative movement.

Projecting from the head 4 and lying in the same plane therewith, is a rigid arm 14, to the inner end of which the bifurcated end 15 of an adjustable arm/16 is pivoted, said arm r16v being shown as disposed 'in the same plane with vthe head and the rigid arm 14, and as projecting at an angle from the latter. The arm 16 carries one or more ears 17 on its rear side, to which an adjusting bolt 18 is pivoted, said bolt passing loosely through an opening 19 in the lower end of an ear 20 which depends from the lower side of the head 4, and receiving a pair of nuts 21 and 22 on opposite sides of said car. By this means, the arm 16 may be adjusted toward or away from the arm 14 Iby proper manipulation of the nuts 21 and 22, after which said nuts may be tightened, thereby locking the arm 16 in adjusted position. It will be readily understood that various inaccuracies in the device may be positively overcome by making adjustments as above described.

With the parts in working position, the upper edge of the blade 1 projects centrally between the arms 14 and 16, whereby when said arms are positioned upon a cylindrical body, as seen in dotted lines in Fig. 1, said upper edge of the blade will represent the exact center of the body in one direction, it being understood that the tool is turned substantially 90o to locate the center in the opposite direction.

From the foregoing description taken in connection with the accompanying drawings, it will be seen that I have provided an extremely simple tool for carrying out the objects of the invention, yet one which will be highly ehcient in operation.

In the preceding description, I have used the terms upper and lower, these terms being readily applicable to the device, as illustrated in the drawings, but it will be understood that the device need not be employed in the exact position illustrated but may be turned in any appropriate manner for accomplishing the best results.

f claim: y

y1. A tool comprising a head, a 'rigid arm will be the upper end of the blade projecting therefrom in the same `plane therewith, a movable arm disposed at an angle to the aforesaid arm and lying in the same plane therewith, an ear projecting from the head and located adj aeentv the movable arm, an adjusting bolt carriedfby the ear and the movable arm for adjustingy thev latter, and a bladecarriedby the head and projecting centrally between the xed and movable arms. I v l i2. A tool comprising a head, a rigid. arm

projecting therefrom and lying in the same plane therewith, a movable arm pivoted to the inner end of sailrigid arm, said movable arm being" disposed in the same plane with the rigid arm and being disposed at an angle to said rigid arm, and ear projecting from the head and havingr an opening, an adjusting boltpivoted to the movable arm and passing loosely through said opening, lock nut-s' on said bolt contacting yvv'ith the opposite sides of ysaid ear, and a blade carried byy the `head and' disposedv centrally betvveen'the fixed and movable arms.

The? combination With a blade, of a lhead slidablethereon, a rigid arm projecting from the head and lying at an angle to vthe blade, a bifurcated movable arm straddling said-blade and 'pivoted to the rigid arm, said'bifurcated. arm being likewise disposed at an angle to thefblade, an ear projecting from thehead and lying adjacent the movablel arm, and an adjusting bolt carried by the ear and the arm for adjusting the latter and for locking the same against movement. y ,n

ln testimony whereof l have hereunto set my hand in presence oftwosubscribing Witnesses. l

JAMES W. ooiv'rnnav.

` lVitnesses:

FRANK A.y CASTLE, GEORGE A. HADSALL.

Copies of this patentmay .be obtained for ve cents each, by addressing the Commissioner of Patents,

' Washington, D. C. l 

